Available on old Apple Macintosh computers and on NeXT computers.
Standard: IEEE 1196, "Nubus-A simple 32-bit backplane bus".
Texas Instruments owns the standard today.
 (at the card)
 (at the card)
 (at the computer)
 (at the computer)
UNKNOWN CONNECTOR at the card.
UNKNOWN CONNECTOR at the computer.
| Pin | Name | Description | 
|---|---|---|
| 1 | -12 V | -12 VDC | 
| 2 | - | |
| 3 | /SPV | |
| 4 | /SP | |
| 5 | /TM1 | |
| 6 | /AD1 | Address/Data 1 | 
| 7 | /AD3 | Address/Data 3 | 
| 8 | /AD5 | Address/Data 5 | 
| 9 | /AD7 | Address/Data 7 | 
| 10 | /AD9 | Address/Data 9 | 
| 11 | /AD11 | Address/Data 11 | 
| 12 | /AD13 | Address/Data 13 | 
| 13 | /AD15 | Address/Data 15 | 
| 14 | /AD17 | Address/Data 17 | 
| 15 | /AD19 | Address/Data 19 | 
| 16 | /AD21 | Address/Data 21 | 
| 17 | /AD23 | Address/Data 23 | 
| 18 | /AD25 | Address/Data 25 | 
| 19 | /AD27 | Address/Data 27 | 
| 20 | /AD29 | Address/Data 29 | 
| 21 | /AD31 | Address/Data 31 | 
| 22 | GND | Ground | 
| 23 | GND | Ground | 
| 24 | /ARB1 | |
| 25 | /ARB3 | |
| 26 | /ID1 | |
| 27 | /ID3 | |
| 28 | /ACK | |
| 29 | +5 V | +5 VDC | 
| 30 | /RQST | |
| 31 | /NMRQ | |
| 32 | +12 V | +12 VDC | 
| Pin | Name | Description | 
|---|---|---|
| 1 | -12 V | -12 VDC | 
| 2 | GND | Ground | 
| 3 | GND | Ground | 
| 4 | +5 V | +5 VDC | 
| 5 | +5 V | +5 VDC | 
| 6 | +5 V | +5 VDC | 
| 7 | +5 V | +5 VDC | 
| 8 | * | Reserved ? | 
| 9 | * | Reserved ? | 
| 10 | * | Reserved ? | 
| 11 | * | Reserved ? | 
| 12 | GND | Ground | 
| 13 | GND | Ground | 
| 14 | GND | Ground | 
| 15 | GND | Ground | 
| 16 | GND | Ground | 
| 17 | GND | Ground | 
| 18 | GND | Ground | 
| 19 | GND | Ground | 
| 20 | GND | Ground | 
| 21 | GND | Ground | 
| 22 | GND | Ground | 
| 23 | GND | Ground | 
| 24 | ** | Reserved ? | 
| 25 | ** | Reserved ? | 
| 26 | ** | Reserved ? | 
| 27 | ** | Reserved ? | 
| 28 | +5 V | +5 VDC | 
| 29 | +5 V | +5 VDC | 
| 30 | GND | Ground | 
| 31 | GND | Ground | 
| 32 | +12 V | 
| Pin | Name | Description | 
|---|---|---|
| 1 | /RESET | Reset | 
| 2 | - | |
| 3 | +5 V | +5 VDC | 
| 4 | +5 V | +5 VDC | 
| 5 | /TM0 | |
| 6 | /AD0 | Address/Data 0 | 
| 7 | /AD2 | Address/Data 2 | 
| 8 | /AD4 | Address/Data 4 | 
| 9 | /AD6 | Address/Data 6 | 
| 10 | /AD8 | Address/Data 8 | 
| 11 | /AD10 | Address/Data 10 | 
| 12 | /AD12 | Address/Data 12 | 
| 13 | /AD14 | Address/Data 14 | 
| 14 | /AD16 | Address/Data 16 | 
| 15 | /AD18 | Address/Data 18 | 
| 16 | /AD20 | Address/Data 20 | 
| 17 | /AD22 | Address/Data 22 | 
| 18 | /AD24 | Address/Data 24 | 
| 19 | /AD26 | Address/Data 26 | 
| 20 | /AD28 | Address/Data 28 | 
| 21 | /AD30 | Address/Data 30 | 
| 22 | GND | Ground | 
| 23 | /PFW | |
| 24 | /ARB0 | |
| 25 | /ARB2 | |
| 26 | /ID0 | |
| 27 | /ID2 | |
| 28 | /START | |
| 29 | +5 V | +5 VDC | 
| 30 | +5 V | +5 VDC | 
| 31 | GND | Ground | 
| 32 | /CLK | Clock | 
Power to slot; 2 amps per slot maximum continuous.
Power to slot; 0.25 amps per slot maximum continuous.
Power to slot; 0.1 amps per slot maximum continuous.
Unused
Power return for +5V, +12V, and -12V
Open collector signal; card should use to reset circuitry.
Slot Parity Valid; asserted if card provides parity. Never asserted under Apple NuBus.
Slot Parity; odd parity of AD0-AD3 if SPV asserted.
Transaction modifiers.
Address/Data bits 31 to 0.
Power Fail Warning given 2ms before AC power is lost.
Arbitration bits 3 to 0; arbitrates system mastership.
Geographical address 3 to 0; hard-coded to slot.
Asserted to indicate an address on AD lines.
Acknowledge of START cycle.
Request; asserted to request bus mastership.
Non-master request; used to signal an interrupt.
Clock. Asymmetrical 10MHz clock; synchronous transactions on NuBus.
| Contributor: | Joakim Ögren, Karsten Wenke, Michael Van den Acker, Godel? | 
| Source: | Apple Tech Info Library 2194: Macintosh II NuBus Slots, Pinout at Apple TIL homepage | 
  Copyright © The Hardware Book Team 1996-2004.
  May be copied and redistributed, partially or in whole, as appropriate.
  Document last modified: 2002-01-10